Abstract
A class of thermal stable of green-emitting phosphors Ba(3)Y(PO(4))(3):Ce(3+),Tb(3+) (BYP:Ce(3+),Tb(3+)) and red-emitting phosphors Ca(3)Y(AlO)(3)(BO(3))(4):Eu(3+) (CYAB:Eu(3+)) for white-light fluorescent lamps were synthesized by high temperature solid-state reaction. We observed a decay of only 3% at 150 °C for BYP:0.25Ce3+,0.25Tb3+ (3% for LaPO4:Ce(3+),Tb(3+)), and a decay of 4% for CYAB:0.5Eu(3+) (7% for Y(2)O(3):Eu(3+), 24% for Y(2)O(2)S:Eu(3+)). The emission intensity of composition-optimized Ba(3)(Y(0.5)Ce(0.25)Tb(0.25))(PO(4))(3) is 70% of that of commercial LaPO(4):Ce(3+),Tb(3+) phosphors, and the CIE chromaticity coordinates are found to be (0.323, 0.534). The emission intensity of Ca(3)(Y(0.5)Eu(0.5))(AlO)(3)(BO(3))(4) is 70% and 83% of those of Y(2)O(3):Eu(3+) and Y(2)O(2)S:Eu(3+) phosphors, respectively, and the CIE chromaticity coordinates are redder (0.652, 0.342) than those of Y(2)O(3):Eu(3+) (0.645, 0.347) and Y(2)O(2)S:Eu(3+) (0.647, 0.343). A white-light fluorescent lamp is fabricated using composition-optimized Ba(3)(Y(0.5)Ce(0.25)Tb(0.25))(PO(4))(3) and Ca(3)(Y(0.5)Eu(0.5))(AlO)(3)(BO(3))(4) phosphors and matching blue-emitting phosphors. The results indicate that the quality of the brightness and color reproduction is suitable for application in shortwave UV fluorescent lamps. The white-light fluorescent lamp displays CIE chromaticity coordinates of x = 0.33, y = 0.35, a warm white light with a correlated color temperature of 5646 K, and a color-rendering index of Ra = 70.
Highlights
IntroductionIn the mid 1970s, fluorescent lamps containing a mixture of triphosphors-the blue-emitting BaMgAl10O17:Eu2+ (BAM) [1,2], the red-emitting Y2O3:Eu3+ [3,4] oxides, and the greenemitting LaPO4:Ce3+,Tb3+ [5,6]—became commercially available
The results indicate that the quality of the brightness and color reproduction is suitable for application in shortwave UV fluorescent lamps
In the mid 1970s, fluorescent lamps containing a mixture of triphosphors-the blue-emitting BaMgAl10O17:Eu2+ (BAM) [1,2], the red-emitting Y2O3:Eu3+ [3,4] oxides, and the greenemitting LaPO4:Ce3+,Tb3+ [5,6]—became commercially available
Summary
In the mid 1970s, fluorescent lamps containing a mixture of triphosphors-the blue-emitting BaMgAl10O17:Eu2+ (BAM) [1,2], the red-emitting Y2O3:Eu3+ [3,4] oxides, and the greenemitting LaPO4:Ce3+,Tb3+ [5,6]—became commercially available. These phosphors have been some of the most popular commercialized oxide phosphors. The phosphors must have strong optical absorption in the shortwave UV region of 254 nm
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have